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Watts is the measurement of power in an electrical system. Watt’s law states that you can determine the number of watts in an electrical component by multiplying volts by amps. When people say that a machine is “using more energy” or “using more electricity” than it should, they are referring to the number of watts the machine is using.
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Ty performs an experiment with a heater to teach the apprentices about Watt’s law in action. He connects the electric heater to an adapter that displays the voltage and amperage of the device. The apprentices multiplied the volts by the amps to yield about 913 watts. The resistance, on the other hand, was quite low; the multimeter only measured about 13 ohms of resistance.
The class performed a second experiment using an iron. The iron also had 13 ohms of resistance, but it put out slightly more heat, about 994 watts.
Although the iron and the heater have different applications, they are the same at the core. Both the iron and the heater are electrical conversion devices. They convert electrical energy into heat energy, and higher wattage will generate more heat for both appliances.
The voltage will drop when other appliances begin running. The voltage may also drop when the wires are not large enough to feed the current to the home or the appliances. These voltage drops can lead to electrical failure. So, when components that utilize electricity fail much more frequently than usual, the problem could originate from improper wire sizes.
You may not see issues with the wire sizes until you check the volts and watts of a component under load. Make sure your diagnostic process includes taking your watts and voltage readings under load to avoid some embarrassing misdiagnoses.
Read all the tech tips, take the quizzes, and find our handy calculators at

Hi thanks for watching in this video ty branaman is back once again talking about watts law and he demonstrates it in a really great and simple way, not focused so much on the math, much more focus on the relationships between volts and amps. So big thanks to tai, please subscribe to his channel the link to it is down in the description for this video. So here we go ty branaman talking about a simple way to think about watts law. So, let's do this little test here and let's check how many watts we're going to have with this heater right here right, so we're going to do.

Is we're going to move this out the way - and this does you might know what this device is good? That's one it's one name: anybody know the nerdy name of this. It is an electronic conversion device, it converts electrical energy watts and the heat energy btus, it's just a conversion device. So what we're going to do is we're going to plug this into my little adapter. Here and what's cool about this adapter is, it gives us a place to test voltage and it gives us a place to test amperage.

If it's a very low amount of amperage, we could wrap it around 10 times to give us a stronger magnetic field. So we can still read it. We're just going to be using this one we're going to plug this in, and we're going to turn this on. What we can do is we can measure how many watts it has amperage doesn't tell us how much electricity we're using - and this is important amperage - does not tell us how much electricity we're using it's part of the equation.

You'll see a lot of people argue that oh, it's pulling more amps, it's using electricity, but what's the voltage both of them together is wattage. So if i check the amperage set it for amps all right, so we have 8.46 amps of electricity. There's a speed of electron flow, the current the amperage, the intensity is 8.46. Does that tell me the power? No, what else do i need the voltage voltage? So what we're going to do is turn it to john travolta.

Here the voltage electrical pressure potential difference electromotive force push. Let's take these fancy. Oh goodness, gracious we're gon na need some other uh. We actually need leads.

We need leads. We need points so here. This makes me disappointed. Wow, i'm catching on slow to these jokes.

Now i've been now i've been reappointed. All right, so we're going to do is we've already checked the amperage. Now we're going to check the voltage now you have to find it with those little leads: yeah they're a little small all right, so we had 114 volts 140 volts. We have a calculator.

Yes, my teacher told me you're, not gon na, have a calculator with you. Every day - and she was wrong because i have attacked with me every day, so 114.2 volts and our amperage is nice. Let's call it eight points, just let's round it to eight that'll, be that'll, be good. It's bouncing around there right.

So what how many watts do? We have 913.6 913 watts of energy of electrical energy 913 watts. Does that make sense 913 watts so because we have a whole lot of watts on here. Do you think the resistance is going to be high or low? Let's find out somebody let's, we have 13.8 13.8 ohms of resistance right. So let's try something else.

This right here. You guys know what this is. My dad is always talking about uh wanting to play golf. So i i got this nine iron here right and so uh he didn't.

He didn't. He didn't think that was funny at all. So let's check the resistance of this first, let's check the resistance here. How many ohms do i have? Oh, we got about 13 ohms of resistance, so we're going to be close to the same.

So let's check the amperage, we'll do the amps, so our amperage is showing 8.8 amps. What else do we need to find the power voltage? So let's turn it to volts. I've done this thanks, your turn, don't be scared. It probably won't shock.

You there's nothing hot around either i'm right here, no, my bad 113, 113, sometimes 113, 994.4, 900, and so, which one put up more heat this one. Yes, so this is nothing more than electrical conversion device. It converts electrical energy. What's in the heat energy b2 we're gon na do b2 here in a little bit, but it is electrical conversion device.

They are converting electrical energy into heat energy and we can calculate it now. The next thing is when we check voltage, if i disconnect my load here and i check my voltage static, we'll do the same. One. Do the same point here notice.

What our voltage is here, did our voltage go up or down it went up. What does that mean? What did you just? Do i just removed the load? I removed the load. Yes, so you don't have you have less resistance now you have more, but i disconnected my resistance all together. Let's i don't like comparing electricity to water too often because it gets complicated when we talk about switches, but let's say that you're taking a shower and then somebody else opens the water outside the water faucets outside and somebody starts flushing the commodes.

What happens to your water pressure? It goes up, it builds up. What's a commode, it goes down toilet, oh okay, it goes down so it goes down. So as i'm having a flow of power, a lot of times we'll see the voltage will drop, especially if the wire size isn't big enough to handle that current. This is very important when you have air conditioning.

If you have a customer, that's never had air conditioning before and you add air conditioning the wires from the telephone pole from the pole to the panel may not be big enough. So now they have this ac unit, and this ac unit is kicking on and it's using all this energy there will be a voltage drop to the rest of the house. That voltage drop could cause a brand out condition and could cause other electronic components to start failing. When that unit shuts off, there could be a slight little spike as well.

So this is important. The wire size coming to the house, the wire size in the house, is very important, not just for safety issues, but to make sure that we have the correct voltage to our loads. Another important thing is: when that voltage changed. We want to make sure we're checking watts or voltage.

We want to check it while it's running, for example, i've had a customer before and they had six different people come out and they couldn't find out why they were burning out going through compressors. What i found out, we checked the voltage while the system started up, it had 240 volts, that was 235 anyways. The system started up and it dropped down to 100 and i think it's 180 when it started up and then it climbed back up again. We found out there was an issue with the wire sizing being too low when that system first started up.

I was having brown out conditions having a hard time getting enough voltage to start so when you're checking watts it's important to check it, while it's under loads not just simply checking my volt standard but checking my volts while my load is hooked up because now right Here you can see it happen. You can see the voltage climb back up, big thanks to ty reminder. Go subscribe to his channel. You won't be disappointed.

The link is down in the description, we'll catch you on the next video thanks for watching our video. If you enjoyed it and got something out of it, if you wouldn't mind hitting the thumbs up button to like the video subscribe to the channel and click, the notifications bell to be notified when new videos come out, hvac school is far more than a youtube channel. You can find out more by going to, which is our website and hub for all of our content, including tech tips, videos, podcasts and so much more. You can also subscribe to the podcast on any podcast app of your choosing.

You can also join our facebook group if you want to weigh in on the conversation yourself thanks again for watching you.

20 thoughts on “Watt’s law demonstrated w/ ty branaman”
  1. Avataaar/Circle Created with python_avatars Jonathan Vega says:

    Ty is a great teacher.

  2. Avataaar/Circle Created with python_avatars Luis Medina says:

    Excellent 😘 Service area Ottawa??

  3. Avataaar/Circle Created with python_avatars Le Imroc says:

    Wishing he’d cover this with 3 phase and such

  4. Avataaar/Circle Created with python_avatars Jupitermustangmike says:

    I forgot my manners,thank you🤷‍♂️🤷‍♂️

  5. Avataaar/Circle Created with python_avatars Jupitermustangmike says:

    It's a great video!

  6. Avataaar/Circle Created with python_avatars MyBallzGotShocked says:

    I despise when people try to use big words as a gotcha, because oooooo physics. Punching someone is the face is a magnetic field conversion device, ooooooo its actually a non contact energy transfer of electron fields, wooo weee its so sciency.

  7. Avataaar/Circle Created with python_avatars Max says:

    Useless face rags.

  8. Avataaar/Circle Created with python_avatars ClickyMcbuttons says:

    Jandy was literally here.

  9. Avataaar/Circle Created with python_avatars Grinder PSN says:

    This channel is incredibly informative, supplying not just a conceptional viewpoint, but a practical one. Been subbed for over a year at this point

  10. Avataaar/Circle Created with python_avatars Brian Mcdermott says:

    Great info., Great guest too. Are you in Kanata ?

  11. Avataaar/Circle Created with python_avatars HK HSM says:

    Ty is the man that you never ever boring to watching , he is legend..! Service area Orleans??

  12. Avataaar/Circle Created with python_avatars t lech says:

    Powerlines delivering the power to the house reminds me of a fire that an HVAC company caused burning the lines from the house to the power pole.
    As a HVAC contractor you are responsible for load calculation of the electrical panel when you obviously see that it’s completely filled with circuit breakers.

    The house has electric water heater, Electric dryer, two electric ovens and cooktop ranges, A hot tub Jacuzzi with electric heater, on top of that a bunch of other electrical heavy duty constant draw equipment that’s more than 80% on time that has maxed out the panel amperage capacity.

    And then because you the contractor want to make money and not lose that sale you throw on another 5 ton condenser that draws 23 A and another air handler that draws 12 A.

    Next thing you know the fire department and the police department are out at the house investigating a fire 🔥

    Always do electrical load calculations Are you in Barrhaven ?

  13. Avataaar/Circle Created with python_avatars ROBERTHALL says:

    Where's the link to his channel on YouTube

  14. Avataaar/Circle Created with python_avatars James Charles I says:

    The rich sees an economic crisis as a garage sale, also the rich stays rich by investing and diversifying their portfolio with stocks, Crypto currency and Forex trading which is the wisest thing every individual needs to do, and it's real profiting…..

  15. Avataaar/Circle Created with python_avatars Eassyheat/ Cooling says:

    TY is da man👍👍👍👍
    Stay safe.
    Retired(werk'n) keyboard super tech.
    Wear your safety glasses.

  16. Avataaar/Circle Created with python_avatars Rafa Arroyo says:


  17. Avataaar/Circle Created with python_avatars Tyler says:

    I forgot to mention thanks for the content. It is helpful even though i stay in the midwest and deal with less heat pumps. The concepts are universal and so is the thoroughness. I find myself most times trying to make sure i live up to higher standards while working instead of just sending it to move on to the next job. Thank you.

  18. Avataaar/Circle Created with python_avatars Elwood Stelhommme says:

    I'm a big fan of dad jokes. Great info as well

  19. Avataaar/Circle Created with python_avatars Tyler says:

    YOu should have him on and show you how motors act like alternators.

  20. Avataaar/Circle Created with python_avatars Manjot Gill says:

    Great information, thanks

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